netbsd32_exec_elf32.c

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    1 /*      $NetBSD: netbsd32_exec_elf32.c,v 1.29 2008/10/26 07:07:35 mrg Exp $     */
    2 /*      from: NetBSD: exec_aout.c,v 1.15 1996/09/26 23:34:46 cgd Exp */
    3 
    4 /*
    5  * Copyright (c) 1998, 2001 Matthew R. Green.
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   27  */
   28 
   29 /*
   30  * Copyright (c) 1993, 1994 Christopher G. Demetriou
   31  * All rights reserved.
   32  *
   33  * Redistribution and use in source and binary forms, with or without
   34  * modification, are permitted provided that the following conditions
   35  * are met:
   36  * 1. Redistributions of source code must retain the above copyright
   37  *    notice, this list of conditions and the following disclaimer.
   38  * 2. Redistributions in binary form must reproduce the above copyright
   39  *    notice, this list of conditions and the following disclaimer in the
   40  *    documentation and/or other materials provided with the distribution.
   41  * 3. All advertising materials mentioning features or use of this software
   42  *    must display the following acknowledgement:
   43  *      This product includes software developed by Christopher G. Demetriou.
   44  * 4. The name of the author may not be used to endorse or promote products
   45  *    derived from this software without specific prior written permission
   46  *
   47  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   48  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   49  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   50  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   51  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   52  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   53  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   54  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   55  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   56  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   57  */
   58 
   59 #include <sys/cdefs.h>
   60 __KERNEL_RCSID(0, "$NetBSD: netbsd32_exec_elf32.c,v 1.29 2008/10/26 07:07:35 mrg Exp $");
   61 
   62 #define ELFSIZE         32
   63 
   64 #include <sys/param.h>
   65 #include <sys/systm.h>
   66 #include <sys/proc.h>
   67 #include <sys/malloc.h>
   68 #include <sys/vnode.h>
   69 #include <sys/exec.h>
   70 #include <sys/exec_elf.h>
   71 #include <sys/resourcevar.h>
   72 #include <sys/signal.h>
   73 #include <sys/signalvar.h>
   74 #include <sys/kauth.h>
   75 #include <sys/namei.h>
   76 
   77 #include <compat/netbsd32/netbsd32.h>
   78 #include <compat/netbsd32/netbsd32_exec.h>
   79 
   80 #include <machine/frame.h>
   81 #include <machine/netbsd32_machdep.h>
   82 
   83 int netbsd32_copyinargs(struct exec_package *, struct ps_strings *,
   84                         void *, size_t, const void *, const void *);
   85 int ELFNAME2(netbsd32,probe_noteless)(struct lwp *, struct exec_package *epp,
   86                                       void *eh, char *itp, vaddr_t *pos);
   87 extern int ELFNAME2(netbsd,signature)(struct lwp *, struct exec_package *,
   88                                       Elf_Ehdr *);
   89 
   90 int
   91 ELFNAME2(netbsd32,probe)(struct lwp *l, struct exec_package *epp,
   92                          void *eh, char *itp, vaddr_t *pos)
   93 {
   94         int error;
   95 
   96         if ((error = ELFNAME2(netbsd,signature)(l, epp, eh)) != 0)
   97                 return error;
   98 
   99         return ELFNAME2(netbsd32,probe_noteless)(l, epp, eh, itp, pos);
  100 }
  101 
  102 int
  103 ELFNAME2(netbsd32,probe_noteless)(struct lwp *l, struct exec_package *epp,
  104                                   void *eh, char *itp, vaddr_t *pos)
  105 {
  106         int error;
  107 
  108         if (itp) {
  109                 /*
  110                  * If the path is exactly "/usr/libexec/ld.elf_so", first
  111                  * try to see if "/usr/libexec/ld.elf_so-<arch>" exists
  112                  * and if so, use that instead.
  113                  * XXX maybe move this into compat/common
  114                  */
  115                 error = 0;
  116                 if (strcmp(itp, "/usr/libexec/ld.elf_so") == 0 ||
  117                     strcmp(itp, "/libexec/ld.elf_so") == 0) {
  118                         extern const char machine32[];
  119                         struct nameidata nd;
  120                         char *path;
  121 
  122                         if (epp->ep_interp != NULL)
  123                                 vrele(epp->ep_interp);
  124                         
  125                         path = PNBUF_GET();
  126                         snprintf(path, MAXPATHLEN, "%s-%s", itp, machine32);
  127                         NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, path);
  128                         error = namei(&nd);
  129                         /*
  130                          * If that worked, save interpreter in case we
  131                          * actually need to load it
  132                          */
  133                         if (error != 0)
  134                                 epp->ep_interp = NULL;
  135                         else
  136                                 epp->ep_interp = nd.ni_vp;
  137                         PNBUF_PUT(path);
  138                 }
  139 
  140                 /* Translate interpreter name if needed */
  141                 if (error && (error = emul_find_interp(l, epp, itp)) != 0)
  142                         return error;
  143         }
  144         epp->ep_flags |= EXEC_32;
  145         epp->ep_vm_minaddr = VM_MIN_ADDRESS;
  146         epp->ep_vm_maxaddr = USRSTACK32;
  147 #ifdef ELF_INTERP_NON_RELOCATABLE
  148         *pos = ELF_LINK_ADDR;
  149 #endif
  150         return 0;
  151 }
  152 
  153 /* round up and down to page boundaries. */
  154 #define ELF_ROUND(a, b)         (((a) + (b) - 1) & ~((b) - 1))
  155 #define ELF_TRUNC(a, b)         ((a) & ~((b) - 1))
  156 
  157 /*
  158  * Copy arguments onto the stack in the normal way, but add some
  159  * extra information in case of dynamic binding.
  160  */
  161 int
  162 netbsd32_elf32_copyargs(struct lwp *l, struct exec_package *pack,
  163     struct ps_strings *arginfo, char **stackp, void *argp)
  164 {
  165         size_t len;
  166         AuxInfo ai[ELF_AUX_ENTRIES], *a;
  167         struct elf_args *ap;
  168         int error;
  169 
  170         if ((error = netbsd32_copyargs(l, pack, arginfo, stackp, argp)) != 0)
  171                 return error;
  172 
  173         a = ai;
  174 
  175         /*
  176          * Push extra arguments on the stack needed by dynamically
  177          * linked binaries
  178          */
  179         if ((ap = (struct elf_args *)pack->ep_emul_arg)) {
  180 
  181                 a->a_type = AT_PHDR;
  182                 a->a_v = ap->arg_phaddr;
  183                 a++;
  184 
  185                 a->a_type = AT_PHENT;
  186                 a->a_v = ap->arg_phentsize;
  187                 a++;
  188 
  189                 a->a_type = AT_PHNUM;
  190                 a->a_v = ap->arg_phnum;
  191                 a++;
  192 
  193                 a->a_type = AT_PAGESZ;
  194                 a->a_v = PAGE_SIZE;
  195                 a++;
  196 
  197                 a->a_type = AT_BASE;
  198                 a->a_v = ap->arg_interp;
  199                 a++;
  200 
  201                 a->a_type = AT_FLAGS;
  202                 a->a_v = 0;
  203                 a++;
  204 
  205                 a->a_type = AT_ENTRY;
  206                 a->a_v = ap->arg_entry;
  207                 a++;
  208 
  209                 a->a_type = AT_EUID;
  210                 a->a_v = kauth_cred_geteuid(l->l_cred);
  211                 a++;
  212 
  213                 a->a_type = AT_RUID;
  214                 a->a_v = kauth_cred_getuid(l->l_cred);
  215                 a++;
  216 
  217                 a->a_type = AT_EGID;
  218                 a->a_v = kauth_cred_getegid(l->l_cred);
  219                 a++;
  220 
  221                 a->a_type = AT_RGID;
  222                 a->a_v = kauth_cred_getgid(l->l_cred);
  223                 a++;
  224 
  225                 free((char *)ap, M_TEMP);
  226                 pack->ep_emul_arg = NULL;
  227         }
  228 
  229         a->a_type = AT_NULL;
  230         a->a_v = 0;
  231         a++;
  232 
  233         len = (a - ai) * sizeof(AuxInfo);
  234         if ((error = copyout(ai, *stackp, len)) != 0)
  235                 return error;
  236         *stackp += len;
  237 
  238         return 0;
  239 }

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FreeBSD/Linux Kernel Cross Reference sys/compat/netbsd32/netbsd32_exec_elf32.c

FreeBSD/Linux Kernel Cross Reference
sys/compat/netbsd32/netbsd32_exec_elf32.c